Efficient quantum memory for light

Morgan P. Hedges (), Jevon J. Longdell, Yongmin Li and Matthew J. Sellars
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Morgan P. Hedges: Laser Physics Centre, Research School of Physics and Engineering, Australian National University, Canberra, Australian Capital Territory 0200, Australia
Jevon J. Longdell: Jack Dodd Centre, University of Otago
Yongmin Li: State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University
Matthew J. Sellars: Laser Physics Centre, Research School of Physics and Engineering, Australian National University, Canberra, Australian Capital Territory 0200, Australia

Nature, 2010, vol. 465, issue 7301, 1052-1056

Abstract: A solid-state quantum memory for light The quantum computers and communication networks of the future will require memory devices that can efficiently store and retrieve the quantum nature of light. Previous quantum memory demonstrations have shown efficiencies of less than 20%, using weak inputs and atomic gases as the storage medium. Morgan Hedges and colleagues now describe a solid-state quantum memory with light stored by praseodymium ions within an yttrium orthosilicate crystal. A total efficiency as high as 69%, and accuracy to within a fraction of a photon is achieved, even with relatively bright light. With improvements to the crystal materials, the technique should meet the demands for practical quantum information applications.

Date: 2010
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DOI: 10.1038/nature09081

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